No Frills has writers with great books, and understated covers to give the business impression of don't judge a book by it's cover.
Then No Frills is doing those writers a serious disservice. Because judging a book by its cover is exactly what readers, reviewers and bookstore personnel do, and there's nothing wrong with this. A cover says something not only about the story but about the publisher as well.
Covers like those of No Frills books don't say "Judge me by the story inside". They say, "Publisher is incapable of hiring or unwilling to hire a professional cover artist, and writer may be too inexperienced to realize this isn't a good thing."
Or, to put it in fewer words, they say either "amateur hour" or "vanity press".
Slander is spoken, libel is written.So, to me, I want to encourage all you writers who are working very hard to get an agent, or land a book deal to be very careful who you slander, especially someone well known in the industry.
But I'm sure if you become one of those "well known in the industry" people, you won't confuse the two.